From nobody Fri Dec 19 17:16:25 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E74526A0FC; Mon, 19 May 2025 08:33:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747643628; cv=none; b=f45skPl3C8tlgJisSSQYzeYyDn/rMzjOgAoUXRn9DGfFTP1xWbCyeR81uNjTWQrVrFtn6O+7rfhR+rD4nceEyt6XuGVV+BTk+rXrTFaVTgVMk18B6+YpX8txkpr5AfJ0pmPzQvNQsI+Vv+BjWrsUC9G+HfkLK/cxqIP+m4NK4Z0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747643628; c=relaxed/simple; bh=pwZXtl/WvAETVW2Q9kzZx42EnMu4I6m9m2c2dTOLLAU=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=KX6N4i8ftyYB+OqxOUcEOqVxv60s4Km2ilPzI6U7bBXKOjGP4YVtWdTftqjLF7torMoQ/BpQSb8d307LXN+rGEpUipYPfaltH1ESAJH7w9OVqDaZoiEXgaJvpK0WifR7pVhWsxvrruE1mTdj+bSMCag5lCR19Wn5DYtqjSP+lKk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=3QQh7B/J; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=prdP/94x; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="3QQh7B/J"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="prdP/94x" Message-ID: <20250519083027.146958941@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1747643625; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=PCA8zcYARmCtjK0DZG8HOTyBlYYfkMraqZDIC30JbuM=; b=3QQh7B/J2X7PG2PHnvqTeLRKRL28cid3zt9CtR6doa/32ySyBx4LDPuJrkljQoawQ/uLxF u3gIjcAfJzClEB3glfYaR+CnzXVwsasSEQMeIQWLWZcnyICGhgkjO2PnZ2h8HMDrtglC69 fKQEyjyK7nfLAPZHVw1GFrq4Q6Y2m7YiKCf1LPUqKey8jo8XV2MKP6307BcUE0jHwLCEB3 3u9Zm+V9BlufZuZZKjk+5OWmpX2sqeZEYb/oOAC1bq2YbQvrnFyssZ/btVGVNm3nNPHGqJ EpByuQz6ruEVBPTJEZsDWP3YsYdW4YrH4IdoIEKuWLPlvyDSlZdpcmmhmbLxFQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1747643625; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=PCA8zcYARmCtjK0DZG8HOTyBlYYfkMraqZDIC30JbuM=; b=prdP/94xr3oBJJsoVGryQaTzpivn1oQLX5k7XXf/iMU7ivv8X7YYRp5xJHtP8h9bDKVMhR db03X8I5U6nCHbDA== From: Thomas Gleixner To: LKML Cc: netdev@vger.kernel.org, Richard Cochran , Christopher Hall , John Stultz , Frederic Weisbecker , Anna-Maria Behnsen , Miroslav Lichvar , Werner Abt , David Woodhouse , Stephen Boyd , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Kurt Kanzenbach , Nam Cao , Antoine Tenart Subject: [patch V2 25/26] timekeeping: Provide update for auxiliary timekeepers References: <20250519082042.742926976@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 19 May 2025 10:33:44 +0200 (CEST) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update the auxiliary timekeepers periodically. For now this is tied to the = system timekeeper update from the tick. This might be revisited and moved out of t= he tick. Signed-off-by: Thomas Gleixner --- kernel/time/timekeeping.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) --- --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -131,9 +131,11 @@ static struct tk_fast tk_fast_raw ____c #ifdef CONFIG_POSIX_AUX_CLOCKS static __init void tk_aux_setup(void); static void tk_aux_update_clocksource(void); +static void tk_aux_advance(void); #else static inline void tk_aux_setup(void) { } static inline void tk_aux_update_clocksource(void) { } +static inline void tk_aux_advance(void) { } #endif =20 unsigned long timekeeper_lock_irqsave(void) @@ -2312,11 +2314,13 @@ static bool timekeeping_advance(enum tim /** * update_wall_time - Uses the current clocksource to increment the wall t= ime * + * It also updates the enabled auxiliary clock timekeepers */ void update_wall_time(void) { if (timekeeping_advance(TK_ADV_TICK)) clock_was_set_delayed(); + tk_aux_advance(); } =20 /** @@ -2762,6 +2766,20 @@ static void tk_aux_update_clocksource(vo } } =20 +static void tk_aux_advance(void) +{ + unsigned long active =3D READ_ONCE(aux_timekeepers); + unsigned int id; + + for_each_set_bit(id, &active, BITS_PER_LONG) { + struct tk_data *tkd =3D &timekeeper_data[id + TIMEKEEPER_AUX]; + + guard(raw_spinlock)(&tkd->lock); + if (tkd->shadow_timekeeper.clock_valid) + __timekeeping_advance(tkd, TK_ADV_TICK); + } +} + /** * ktime_get_aux - Get TAI time for a AUX clock * @id: ID of the clock to read (CLOCK_AUX...)